function exportExcel(url,dept){
	var className = $("#className").val();
	if(className == undefined||className==""){
		$btools.alert("请选择一个班级！");
	}else{
		$btools.prompt("确认导出 "+className+" 班级的欠款记录？",function(){
			$btools.blockUI({
				msg : "正在导出，请稍候...",
				time: "1000"
			});
			window.location.href = url+"?className="+className+"&dept="+dept;
		});
	}
	
	
}